Shellac discoloration. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Shellac discoloration. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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For shellac bleaching 8000 parts of chlorinated lime are ground in 200 parts of water and 1000 parts of shellac in coarse powder are added. After a day, add a mixture of 1 part concentrated sulfuric acid in 1000 parts of water and finally 6000 parts of boiling water. A completely white shellac floating on the surface of the liquid is removed and the sticks are rolled out of it.

Author: Korolev V.A.

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MIC28516/7 - 70V/8A Synchronous DC/DC Buck Converters 20.10.2020

Microchip has introduced new synchronous DC/DC buck converters with a wide input voltage range (up to 70 V) and current up to 8 A. They use the latest high-voltage controllers, combined with a pair of powerful N-channel switches. The output voltage can vary in the range of 0,6...32 V with an accuracy of +-1%. The converters are based on the unique Hyper Speed Control architecture, which has increased the high-Vin/low-Vout ratio at up to 95% efficiency.

MIC28516 contains a complete set of functions to protect the microcircuit in the event of abnormal situations. These features include undervoltage protection (UVLO) to ensure proper operation in the event of a power failure, soft start to reduce inrush current, short circuit protection, and overtemperature protection.

MIC28517 contains a similar set of protective functions, but instead of a soft start, it allows you to choose one of two modes of operation of the microcircuit. HyperLight Load mode improves light load efficiency, while Continuous Conduction Mode maintains a constant frequency over the entire load current range.

The converters are produced in 38-pin PQFN packages 6 x 6 mm in size and can operate in the temperature range of -40...125°C.

Main Features:

Input voltage range 4,5...70 V;
Output voltage range 0,6...32 V;
Output current up to 8 A;
Adjustable frequency 270...800 kHz;
Built-in high voltage LDO;
Configurable soft start (only for MIC28516);
Operation mode selection pin (only for MIC28517);
Overtemperature shutdown with hysteresis;
MIC28516 only works in Continuous Conduction Mode to reduce noise at low output current;
Latest generation Power Trench keys;
Compact 6 x 6 mm PQFN housing;
Temperature range -40...125°С.

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